Hoisting-mechanism.



nnirnn srA'rns PATENT OFF Q WILLIAM EDWARD BOEI-ICK, OF JERSEY CITY, NEW JERSEY;

HOISTING MECHANISM.

Specification of LettersBatent;

Application filed December 26, 1913. Serial 'No. 808,632.

To all 'witom it'maycon-cern: 1

Be it known that I, .lVILLIAM EDWARD BOEHOK, a subject of the Emperor of Germany, residing in'Jersey City, in the county of l-Iudson and State of New Jersey, have invented certain new and useful Improve"- ments iii-Hoisting Mechanisms, of which the following is a specification, reference being had'to the accompanyingdrawings.

This invention relates to improvements inhoisting' mechanism and particularly to manually-operated hoisting mechanism, such as that used in portable elevators or tiering machines for raising-the load-carrying platform and an object of this invention. is to provide a manually-operated hoisting mechanism which will safeguard the operator from injury due to the unexpected backward throw of the crank used by him.

' a section on theline 4-'-4 of Fig. 3; and

Fig. 5 shows in perspective the squareheaded operating crank. I

The. side standards or uprightsa are connected by a cross-beam 5 which supports the auxiliary frame-members 0, cl, that carry the outer ends of the shafts ofithe drum and the gears controlling, the same and, the brake mechanism therefor. The drum 6 is mounted fast; upon the Windlass-shaft f'to which the largen spur-gear g is keyed. With the latter meshes the pinion h keyed uponthe same shaft 91' with the smaller; spur-gear. j that meshes with the pinion 7s -keyed'upon the upper windingshaft m. It will be'obvious thatby turning, either of the shafts, z, m, the windlassdrum 6 may be. turned'in adirection that will cause the cable 11,- to be wound uponthe same,,wherebyv the load will be raised, the train of gearinghereinbefore referred to serving as an intermediary forthe transmission-of the power appliedto the shaft. Each of the shafts i, m, is formed with a non-circular (e. 9., squared)-end 0 that projects beyond the outer face of'the auxiliary upright 0; and

sincethe construction and arrangement of the outer ends of these two shafts (which may be designated as windingshafts) is the same, it will sufficeto-describe one ofthem.

. At the base of the'squared portion 0' of the winding-shaft, there "is formedupon the same a' collar 3) which is shaped to fit in Patented Au *7, 191m,

annular groove 9 formed inside of the hub r of? theratchet' wheel 5;, this collar prevents the lattcr from slipping off the shaft outwardly, while the uprightc prevents its movement inwardly lengthwise of the shaft.

This ratchet. wheel 8 is loosely or idly mounted upon the winding-shaft, which is free to turnfreely within thehub of the ratchet-wheel 8 save when the operating crank 25' is in operative. position, as will be more particu'larlyset forth hereinafter. The

ratchet wheel s is further formedi with ratchet teeth 8' which are normally engaged by a spring-controlled pawl u pivotally mounted upon the upright 0,-hence, retrograde movement of the ratchet wheel 8 is preventedatall times by this pawl,but' for,-

ward movement ofthe ratchet wheel is at.

all times free, and unrestrained. Within the hub r of thelatter there is formed a cavity or recess 0 the wall-of which is non-circular and therefore adapted and designed to interlock with the outer wall orfaces ofjthe' head.

tofthe operating crank t, which is formed with a-socket' t"within which fits snugly the squared'end 0 of the winding-shaft (Fig: 1), when the crank t'is in operative'p'osition; and whenthe crank. 2; is in the latter posi-- tion, it will be obvious from what has already been said that the squared head t" of the crank 23 can not turn upon the windingshaft and also cannot turn within the recess 1) of the hub 7- of the ratchet s; from which it follows clearly that, by putting his crank in operative position, the workman interlocks thewinding shaft with the ratchet s idly-mounted thereon, and that, when he turns-the crank t'to wind up .the cable 1n,

the windingrshaft and" the ratchet s' thereon. will turn with the crank as asinglesystem; and, conversely when the crank 27 is disen gaged' from the wind'ing-shaft,'it (the shaft or released at will.

is free to turn within the hub r unrestrained save for the retarding influence of the brake mechanism, which will now be described.

Upon the upper winding-shaft m there is keyed a brake-disk e in a groove in the rim of which there fit the shoes of a pair of brake-jaws 2 the upper ends of which are normally held apart by the coil-spring 3 wound around a cam-shaft A which carries cams 5 adapted to rub against cam-rollers 6 mounted upon lugs 7 projecting from the upper ends of the brake-arms 2 the lower ends of which are connected by the bolt 8. Upon one end of the brake-controlling camshaft A there is fastened a brake-handle 9 by throwing which the brake-j aws 2 may be set Upon the upper shaft we there is mounted fast a pawl-carrier to which carries a pivotally-mounted pawl 00 the toe of which is arranged to engage the internal ratchet-teeth y formed on the brakedis-k When it is desired to pay out the cable a and thereby lower away the load, the workman pulls the brake-handle 9 toward him into the dotted-line position of Fig. 1, whereby he sets the brake so firmly that the pull of the load upon the cable it cannot turn the winding-shaft m in a retrograde or counter-clockwise direction. He next removes the crank 5 from within the hub r of the ratchet-wheel 8 and from off the non-circular end 0 of the winding-shaft m, whereby the connection between the latter and the ratchet-wheel s is destroyed and the holding effect or action of the pawl u upon the shaft is lost. The workman now manipulates the brake-handle 9 so as to lower away the load at the proper speed, keeping the load ever under control by means of the brake. It will be understood that the particular type ofbr-ake is immaterial; a strap brake such as is shown and described in the McCarthy United States Patents Nos. 826,877 and 854,961 may be used equally well, for example.

In accordance with the provisions of the Patent Statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only representative and that the invention can be carried out by other means.

I claim:

1. A hoisting mechanism including a winding shaft; locking mechanism for hold-V ing said shaft against retrograde rotation, while permitting forward rotation thereof; said locking mechanism including an operating device for giving said shaft forward rotation, said device being free to be slipped into and out of engagement with said shaft and mechanism and shaped to interlock the same when engaged therewith and to render said locking mechanism including an operating device for giving said shaft forward rotation, said device being free to be slipped into and out of engagement with said shaft and mechanism and shaped to interlock the same when engaged therewith and to rena der said mechanism operative and being freely removable from said shaft to break the interlocking engagement thereof with said mechanism and to render the latter inoperative; and brake 'mechanism for controlling" the retrograde rotation of said shaft, after said device is disengaged therefrom. o

8. A hoisting mechanism including a winding shaft; locking mechanism for holding said shaft against retrograde rotation, while permitting forward rotation thereof; said locking mechanism including an operating crank for giving said shaft forward rotation, said crank being free to be slipped into and out of engagement with said shaft and mechanism and shaped to interlock the same when engaged therewith and to render said mechanism operative and being freely removable from said shaft to break the interlocking engagement thereof with said mechanism and to render the latter inoperative.

4. A hoisting mechanism including a winding shaft; a rotatable member loosely mounted thereon; a locking device for holding said member against retrograde rotation, while permitting forward rotation thereof; said locking device including an operating device for giving said shaft forward rotation, said operating device being free to be slipped'into and out of engagement with said shaft and member and shaped to interlock the same when engaged therewith and to render said member and locking device operative and being freely removable from said shaft to break the interlocking engagement thereof with said member and to render the latter inoperative.

5. A hoisting mechanism including a winding-shaft; a ratchet-wheel idly mounted thereon; a pawl for controlling said ratchet wheel; an operating crank which is adapted to interlock said wheel with said shaft and which is freely removable to de stroy the interlock therebetween and thereby to permit the retrograde movement of said shaft; and brake mechanism for holding the latter against rotation at the will of the operator.

Cir

6. A hoisting mechanism including a winding shaft; a rotatable member loosely mounted thereon; a locking device for holding said member against retrograde rotation, While permitting forward rotation thereof; said locking device including an operating device for giving said shaft forward rotation, said operating device being free to be slipped into and out of engagement with said shaft and member and shaped to interlock the same when engaged therewith and to render said member and locking device operative and being freely removable from said shaft to break the interlocking engagement thereof with said member and to render the latter inoperative; and brake mechanism for controlling the retrograde rotation of said shaft, after said operating device is disengaged therefrom.

7. A hoisting mechanism including a winding-shaft; an operating crank; and a locking device arranged to permit the rotation in a forward direction; said crank being adapted to interlock said device and shaft operatively and being freely removable to release said shaft from the locking action of said device and thereby permit the retrograde movement of said shaft.

8. A hoisting mechanism including a winding-shaft; a rotatable member loosely mounted on the same; a device for preventing retrograde movement of said member; and means for turning said shaft; said means being adapted to interlock said shaft with said member and being removable to destroy the interlock, therebetween and Copies of this patent may be obtained for thereby to permit the retrograde movement of said shaft.

9. A hoisting mechanism including a winding-shaft; a ratchet-wheel idly mounted thereon; a pawl for controlling said ratchet wheel; and an operating crank which is adapted to interlock said wheel with said shaft and which is freely removable to destroy the interlock therebetween and thereby to permit the retrograde movement of said shaft.

10. A hoisting mechanism including a winding shaft; locking devices for holding the same against retrograde rotation, one of said devices being mounted loosely on said shaft; said locking device including a crank for turning the latter, said crank being shaped to interlock with said shaft and one of said locking devices.

11. A hoisting mechanism including a winding shaft; pawl -and ratchet mechanism one member of which is mounted on Signed at Jersey City New Jersey, this 22nd day of December, A. D. 1913, in the presence of the twoundersigned witnesses. WILLIAM EDWARD BOEHGK.

Witnesses:

JAMns LEO QUIRK, RALPH QUIDoR.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

